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0. FORSYTH & J. H. TRUEX. WEIGHING SCALE.

No. 75,146. Patented Meu"l 3, 1868.

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ORRIN FORSYTl-l AND JOHN H. TRUEX, OF ROGHESTERNEW YORK.

Letters .Patent No. 75,146, dated Zlfarch 3, 1868; antedateo? February 20, 1868.

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TO ALL WHOM lIT MAY CONCERN z' Be it known that we, OnnrN Fonsvrn and JonN H. TnunXLof Rochester, in the county of Monroe, and State of New York, have invented certain new and useful Improvements in Weighing-Scales; and we do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making part of this specification.

Figure 1 is an elevation of the double beam and pendulum-rod of our improved scales.

Figure 2, a vertical cross-section through the sliding tare-weight and its beam.

Figure 3, a cross-section of the pendulum-rod, and a plan of its weights.

Like letters of reference indicate corresponding parts in all the gures.

Our invention consists, essentially, in the combination of a double beam, formed in a single piece, with a pendulum-rod, having double weight-supports, whereby tare and net weight are separately indicated, and in the construction and arrangement of the parts connected therewith.

As represented in the drawings, A is the net and B the tare-beams, connected at a and b, so as to constitute' n single piece. The double beam thusA formedl'has the usual stirrups, c d, for hanging and connecting with the platform, and also the ordinary balance,j`. `Each beam is also provided with ascale of pounds and subdivisions, and with weights, C C', which slide-over them. These weights, for convenience of connection to the beams, are made in halves, which are secured together by screws, g g, as shown, so that they can 'be applied or removed at pleasure The pendulum-rod D is hooked to the beum in the usual way. It is provided with a vertical scale, for indieating heavy loads, and also with two supports, E G, for the reception ofthe weights H H. The support E is fornet weight, and Gr foi-tare weight, corresponding with the beams A B above.

In weighing ture, lif it is very heavy, the weights H are employed to balance the main load, while the sliding weight C', on the beam B, will balance the overplus. When this is done, the net is weighed in the same manner with the weights H and C. If the loads are light, the simple sliding weights C C will accomplish the whole.

Two or more beams, A B, have been before used in a similar manner, not formed, however, in a single piece, but connected by links; but, so farv as we are aware, the employment of the rod D, with the double supports E G, in'combination with the double beams, has never before been known. By this means we are enabled to weigh a heavy load with the same facility as a light one, and to indicate the tare and net separately.

The construction of the beams A B in a single piece not only facilitates the manufacture and lessens the expense, but also renders the device more effective than whlere they are connected .by links, in which case they' ure liable to disarrangement, and ,are rattling and irregular in their action.

As the tare is usually weighed tiret in regular business, it is desirable that the Weight C should be fixed in position, when adjusted, whilethc net is being weighed. In order to accomplish this, we make aline, z, of notches on the lower side of the tare-beam, corresponding with the scale, into which strikes a catch or pawl, z', in the weight'C, held up by any suitable spring, k. The catch is preferably provided with a knob, l, by which not only is it depressed to discngage it from the notches, but the weight itself is also moved on the beam. If desirable, the net-beam and weight may be arranged in the same manner. this arrangement, we can set the weight'in any desired position, and hold it there while the net is being weighed.

In weighing thc net, the action of the beam is frequently so great that, unless the tare-weight is secured, it will slip. Simple notches on top, a's in the ordinary steelyards, would not be effective. The simple device described will obviate all diiculty.

By locating the notches at the bottom instead of the top, the weight is notonly more easily adjusted, but the notches themselves will be removed from wear. In this manner the scale may be used for years, and yet the notches receive no material wear.

That portion, o, of the pendulum-rod D on which the scale is marked is counter-sunk or depressed, leaving the edges 'nt m projecting, as clearly shown in figs. l and 2. Therefore, the weights that are placed over the pendulum-rod will come in contact only with the edges, and will not touch the centre. This not only produces less friction of the weights, but removes the scale entirely from wear, and, therefore, it will endure for years,

and outlive even the apparatus itself. In ordinary Weighing-apparatus, much difficulty is experienced from thc figures becoming obliterated, or -so obscured as to be not readily discerned. It' desirable, the beams A B may be constructed in 'the same manner, though this is not of so much importance.

We make a double scale on the pendulum-rod, to indicate the tare andnet weight. We place the numbers of these scales at such a distance apart as to correspond with the thickness of' the weights H H'. Thus, a single thin weight, balancing five hundred pounds, will come just opposite the number 500 on the scale, and a weight balancing one thousand pounds, placed on top ot' it, will come just opposite the number 1,500, as indicated on the support E. In order to render this arrangement perfect in its action, so that weights of varying thicknesses may be adjusted exactly to the numbers, it is desirable to make the weighbsupports themselves adjustable upand down ou the pendulum-rod. This is accomplished by set-screws, n.

What w-'eolaim as our invention, and desire to secure by Letters Patent, is

v 1. Notching' the underside of the beams, and employing, in combination with the same aud'the sliding weights, a spring-catch, z', operating'in the manner and for the purpose speciiied.

2. Making the supports E G, on the pendulum-rod, adjustable to di'erent distances apart, -in the manner.

and for the purpose herein set forth.

In witness whereof, we have hereunto signed our names in the presence of two subscribing witnesses.

ORRIN FORSYTH,

JOHN H. TRUEX. Witnesses:

R. F. Ossoon, J. A. DAVIS. 

